TONY CRADDOCK / SCIENCE PHOTO LIBRARY TONY CRADDOCK / SCIENCE PHOTO LIBRARY
Heart drug. Pills lying on an ECG (electrocardiogram) trace showing an abnormal heartbeat. Drugs affecting the heart include the beta-blockers, which are used to treat angina pectoris (chest pain due to a lack of oxygen in the heart muscle), hypertension (high blood pressure) and cardiac arrhythmia (irregular heartbeat).
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